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SPH 4UI - Quiz #15
Multiple Choice
Identify the choice that best completes the statement or answers the question.
B
1. A quanta of energy emitted from an atom is
a) a continuous amount of energy
b) a discrete amount of energy
c) the total amount of energy
d) a range of energy
e) none of the above
C
2. The energy, in joules, of light with a frequency of 5.6 ´ 1016 Hz is
a) 5.6 ´ 1016 J
d) 1.2 ´ 10–50 J
b) 8.4 ´ 1049 J
e) 6.63 ´ 10–34 J
c) 3.7 ´ 10–17 J
D
3. The wavelength of light produced by an photon of energy 1.96 eV is
a) 3.13 ´ 10–19 m
d) 6.35 ´ 10–7 m
b) 1.01 ´ 10–25 m
e) 1.57 ´ 106 m
c) 1.98 ´ 10–25 m
C
4. As the intensity (brightness) of light increases in the photoelectric effect, the ejected electrons
a) have a greater velocity
d) remain the same
b) lose kinetic energy
e) none of the above
c) increase in number
A
5. In the photoelectric effect, as the frequency (colour) of light shining on a piece of metal increases, the
ejected electrons
a) gain kinetic energy
d) increase in number
b) lose velocity
e) none of the above
c) remain unchanged
A
6. In the photoelectric effect, the work function is
a) the amount of energy required to release an electron from the surface
b) the same as the threshold frequency
c) the amount of kinetic energy possessed by the electron
d) dependent on the frequency of light
e) none of the above
D
7. The length of a horizontal metre stick moving at 0.83c is
a) 1.00 m
d) 0.56 m
b) 0.66 m
e) 1.51 m
c) 0.44 m
A
8. Flying in a fast rocket ship at a speed of 0.82c, you observe both your watch and a clock outside.
Which of the following statements is true?
a) Time will appear to be the same for you but slower outside.
b) Time will appear slower for you but normal outside.
c) Neither clock runs slow.
d) Both clocks run slow.
e) none of the above
A
9. If a neutron has a rest energy of 939.5 MeV, then it has a mass of
a) 1.67 ´ 10–33 kg.
d) 1.67 ´ 104 kg.
b) 1.67 ´ 10–27 kg.
e) none of the above
1
c) 1.67 ´ 10 kg.